In anatomy, a sinus is a cavity within a bone or other tissue. Most commonly found in the bones of the face and connecting with the nasal cavities. Sinus (anatomy), description of the general term paranasal sinuses, air cavities in the cranial bones, especially those near the nose, including: the maxillary sinuses, also called the maxillary antra and the largest of the paranasal sinuses, are und.
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2

Motion sickness :
Motion sickness can occur when ever your body is in motion or subjected to acceleration / deceleration forces. The vestibular organs in the brain will sense motion. Some patients are more susceptible than others. In particular patients with migraines are predispose to develop this type of reaction. If severe check with your physician for proper diagnosis and treatment.
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5

Motion sickness:
One theory is that it functions as defense mechanism against neurotoxins. The area postrema in the brain is responsible for inducing vomiting when poisons are detected, & for resolving conflict between vision & balance. When feeling motion but not seeing it, the inner ear transmits to the brain that it senses motion, but the eyes tell the brain that everything is still, hence brain responds by vo.
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6

Yes:
Jerky frame movements, rapidly flashing lights, fast action (like car chases), and movements like roller coaster or falling sequences can cause motion sickness in some people, especially if the visual takes up more & more of your field of vision in which you lose your fixed frames of reference and so your brain is confused about position and gravity.
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7

Motion sickness:
Cause is still debated but it is basically a conflict between sensory systems. For example, car sickness is caused by your eyes (which are looking at interior of car and environment is not moving) whereas the fluid in your ear (maintains balance) feels motion of the car.
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